Commit 583b843803c5851c1d9796ba301f6a602a6da3d9 | zig

author	Andrew Kelley <andrew@ziglang.org> 2020-08-18 15:09:48-07:00
committer	Andrew Kelley <andrew@ziglang.org> 2020-08-18 15:09:48-07:00
log	583b843803c5851c1d9796ba301f6a602a6da3d9
tree	fff58c097776c13da3deef009f230747738f5ac7
parent	5547abd2d1fab482ab0d26a92058c94c298ce403

std.heap.GeneralPurposeAllocator: add `never_unmap` config option

This is a temporary debugging trick you can use to turn segfaults into more helpful
logged error messages with stack trace details. The downside is that every allocation
will be leaked!

1 files changed, 8 insertions(+), 1 deletions(-)

lib
- std
  - heap
    general_purpose_allocator.zig

lib/std/heap/general_purpose_allocator.zig+8-1

 @@ -142,6 +142,11 @@ pub const Config = struct {
     /// Whether the allocator may be used simultaneously from multiple threads.
     thread_safe: bool = !std.builtin.single_threaded,
+    /// This is a temporary debugging trick you can use to turn segfaults into more helpful
+    /// logged error messages with stack trace details. The downside is that every allocation
+    /// will be leaked!
+    never_unmap: bool = false,
 };
 pub fn GeneralPurposeAllocator(comptime config: Config) type {
 @@ -416,7 +421,9 @@ pub fn GeneralPurposeAllocator(comptime config: Config) type {
                     bucket.prev.next = bucket.next;
                     self.buckets[bucket_index] = bucket.prev;
                 }
-                self.backing_allocator.free(bucket.page[0..page_size]);
+                if (!config.never_unmap) {
+                    self.backing_allocator.free(bucket.page[0..page_size]);
+                }
                 const bucket_size = bucketSize(size_class);
                 const bucket_slice = @ptrCast([*]align(@alignOf(BucketHeader)) u8, bucket)[0..bucket_size];
                 self.backing_allocator.free(bucket_slice);